<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="../../commont/button.css">
    <title>Button Demo</title>
    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self';">
</head>

<body>
    <hr>
    <button id="btn1">Click Me</button>
    <br />
    <br />
    <button id="btn2">点我有惊喜</button>
    <br />
    <br />
    <button id="btn3">浏览文件</button>
</body>
<script src="button_demo.js"></script>

</html>